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This set of Foundry Technology Multiple Choice Questions & Answers (MCQs) focuses on Foundry Technology Set 9
Q1 | High silicon irons are
- resistant to wear
- brown in colour
- machinable
- malleable
Q2 | Carbondioxide moulding is useful for
- very thin sections
- regular sections
- heavy and thick walled sections
- all of the above
Q3 | A drawback is employed when
- the pattern is too bulky
- the pattern is too long
- the pattern is not made of wood
- the pattern cannot be drawn from mould due to projection
Q4 | In furan moulding which of the following is used as a catalyst?
- Potassium hydroxide
- Phosphoric acid
- Ammonium hydroxide
- Phenol formaldehyde
Q5 | In case of copper, the pouring temperature is around
- 1160?C
- 1060?C
- 1260?C
- 1450?C
Q6 | Polystyrene is generally available in the form of
- trapezoidal moulds
- square sections
- plates
- cylindrical bars
Q7 | If an old casting is to be used as a pattern, to account for various allowances.
- to provide draw screws, holes can be drilled and tapped in the castings
- the castings are cleaned and made smooth
- casting is shaken while withdrawing from mould
- the surfaces are lagged with thin strips of wood or leater
Q8 | The strength of the sand is high if grains are
- round and small
- sharp and irregular in shape
- large and regular in shape
- none of the above
Q9 | A mould which has good erosion resistance to metal flow and is also collapsible is
- green sand mould
- skin dry sand mould
- dry sand mould
- none of the above
Q10 | During the passage of molten metal through the coke, the carbon percentage of the molten metal increases. The absorption of carbon depends on
- size of the coke
- temperature
- time allowed for molten metal to remain in the cupola
- all of the above
Q11 | Hot spots are generally found in castings
- symmetrical about two axes
- having abrupt variation in section
- with uniform cross-section
- small in weight but large in volume
Q12 | Which of the following metals has the lowest melting point?
- Tin
- Silver
- Zinc
- Magnesium
Q13 | Slag in a blast furnace is
- lighter than molten iron
- heavier than molten iron
Q14 | Sprues are generally
- tapered upwards
- tapered downwards
- uniform size
Q15 | When bench moulding is adopted using three boxes, the central box is called
- cope
- cheek
- drag
- none of the above
Q16 | Cores are made from core sand mixed with the binder which may be
- linseed oil
- turpentine
- cement
- none of the above
Q17 | Thermal efficiency of cupola is in the range
- 30 to 50 percent
- 60 to 75 percent
- 50 to 65 percent
- 80 to 90 percent
Q18 | Which of the following sand must possess high refractoriness?
- Backing sand
- Parting sand
- Facing sand
- all of the above
Q19 | The rammer used for packing the sand in pockets/corners of a mould is known as
- Floor rummer
- Hand rammer
- Peen rammer
Q20 | Normal shrinkage allowance for aluminium is 18 mm per metre and that for cast iron 10 mm per metre. If the metal pattern is to be made of aluminium and the casting is to be of cast iron, the shrinkage allowed on wooden master pattern will be
- 10 mm/metre
- 28 mm/metre
- 8 mm/metre
- 18 mm/metre
Q21 | Which of the following defect is likely to occur due to improper design of gatting system?
- Shrinkage
- Porosity
- Mould erosion
- any of the above
Q22 | White cst iron contains
- free graphite
- cementite
- free carbon
- none of the above
Q23 | A slick is mainly used for
- repairing and finishing of mould
- removing pattern from the mould
- making openings in mould
- providing openings in the mould
Q24 | The cross-section of a sprue
- square
- circular
- rectangular
- any of the above
Q25 | Grey cast iron is
- resistant to shock
- least fluid in molten condition
- poor in machining ability
- costlier than other varieties of cast iron